Re: FW: [Bug-gnubg] Simple multi-threading... Cache

[Jonathan Kinsey]

Jim Segrave wrote:
> 
> Yes - cache entries are indexed by position and evaluation (although,
> as I recall, it's evaluation type and no. of plies, so if you were
> doing 2-ply evaluations with different move filters for different
> players, I think it would not see the difference in evaluations.
> 

I've had a look at where multiple evaluations differ (with the same
cache lookup values - basically the same position/eval settings).  It
turns out it's to do with the NNevalAction/State thing, one time it
calculates Evaluate128() and the other EvaluateFromBase128() - they
produce different answers.

This is single threaded - still not sure exactly how the state things
work, maybe I've broken that logic!...

Jon

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